Wetland

A wetland is land that is very wet.

The ground stays soaked with water. This can happen for many years. It can also happen only sometimes.

Some wetlands have trees. These are called swamps. Other wetlands have grasses. These are called marshes. Wetlands are found on every continent. They are not in Antarctica. These places help keep our water clean. They are homes for many plants and animals.

Wetlands are very special places to explore.

A wetland is a place where the land is soaked with water.

This water can stay for many years. It can also come and go with the seasons. Wetlands act like a bridge between dry land and deep water.

Because the soil stays wet, it has very little oxygen. We call this anoxic soil. This means plants must adapt to live in soaked ground.

There are many types of wetlands. Marshes have grasses like reeds. Swamps have woody plants like trees.

Some wetlands have salty water. These are called mangrove forests.

Wetlands help people in many ways. They clean the water by taking out extra nutrients. They also protect shores from storms and help control floods.

Some wetlands store carbon. This helps to slow climate change. However, people are damaging these areas. They do this by building or by polluting the water. We must work to protect these special places.

A wetland is a special place where the land is soaked with water.

This water can stay for years or it may come and go with the seasons. Wetlands act like a bridge between dry land and deep water. They are known as an ecotone, which is a transition zone between two different areas. These places are among the most diverse ecosystems on our planet. They provide homes for many different kinds of plants and animals.

Water covers the soil for long periods of time. This flooding causes the soil to become anoxic, meaning it has very little oxygen. Because of this, plants must have special roots to survive in waterlogged ground. These plants are called hydrophytes.

Different types of wetlands depend on the plants that grow there. Marshes are filled with grasses like reeds and cattails. Swamps are filled with woody plants like trees and shrubs.

Some wetlands, like mangrove forests, have plants that can handle salty water.

People have studied these areas for a long time. In 1971, an international treaty was started to help protect them. This treaty focuses on wetlands of international importance.

Experts use special methods to check how healthy a wetland is. These checks help people understand why we must save them. In the United States, the government uses specific rules to define what a wetland is. This helps them make laws to protect the land.

Wetlands can be found on every continent except Antarctica.

The water can be fresh, salty, or a mix called brackish. Some of the biggest wetlands are the Amazon River basin and the Pantanal in South America.

Others include the West Siberian Plain and the Sundarbans. There are many local names for them too. For example, people in Australia call some wetlands billabongs. In Ireland, they are often called turloughs.

Wetlands do many important jobs for the Earth. They act like a filter to clean water by removing extra nutrients. They also help protect shores from storms and help control floods.

Some wetlands act as a carbon sink. This means they take in and store carbon to help with climate change. However, humans are causing damage to these areas. Activities like building, overfishing, and pollution make them very threatened.

A wetland is a distinct semi-aquatic ecosystem where the ground is flooded or saturated with water. This saturation can be permanent, lasting for decades, or seasonal, occurring only at certain times of the year. Wetlands act as an ecotone, which is a transitional zone between dry terrestrial land and deep aquatic systems. They are unique because they exist at the interface of these two environments. This makes them highly dependent on both land and water systems. Wetlands are among the most biologically diverse ecosystems on Earth.

The most important factor in creating a wetland is hydrology, which is the movement and distribution of water. When water covers the soil or stays near the surface, it creates specific conditions. This flooding leads to anoxic processes, meaning the soil becomes oxygen-poor. Because the soil lacks oxygen, the plants that live there must be specialized. These plants are called hydrophytes, or plants adapted to waterlogged soils. The duration of this flooding determines the type of vegetation that can grow.

Wetlands are categorized into several main types based on their dominant plants. Marshes are dominated by emergent herbaceous vegetation, such as reeds, cattails, and sedges. Swamps are characterized by woody vegetation, such as trees and shrubs. Mangrove forests are a specific type of wetland where halophytic woody plants have evolved to tolerate salty water. Another group includes peatlands, such as bogs and fens. In bogs and fens, the slow decay of dead plants under anoxic conditions leads to the accumulation of organic peat.

We can also classify wetlands by their water source. Tidal wetlands are influenced by ocean tides, while estuaries receive a mix of tidal and river waters. Floodplains are formed by excess water overflowing from rivers or lakes. Some wetlands, like bogs and vernal ponds, rely on rainfall or meltwater. The water itself can be freshwater, brackish, or saltwater. In some regions, such as the United States, scientists use the Cowardin classification system. This system includes marine, estuarine, riverine, lacustrine, and palustrine types.

Wetlands provide many essential ecosystem services that benefit the planet and humans. They act as natural filters by removing excess nutrients like nitrates and phosphorus, which improves water quality. They also help with shoreline stabilization, storm protection, and flood control. Wetlands play a major role in the carbon cycle through carbon fixation and sequestration. Some wetlands act as a carbon sink, helping to mitigate climate change by storing carbon. However, they can also be a source of methane and nitrous oxide emissions due to anaerobic decomposition.

These ecosystems are found on every continent except Antarctica. Large examples include the Amazon River basin and the West Siberian Plain. The Pantanal in South America and the Sundarbans in the Ganges-Brahmaputra delta are also massive wetland systems. Because they are so important, an international treaty was established in 1971. This treaty seeks to identify and protect "wetlands of international importance." This work helps raise public awareness about the vital functions these areas provide.

Despite their importance, wetlands are under significant threat. According to the 2005 Millennium Ecosystem Assessment, wetlands are more threatened by environmental degradation than any other ecosystem on Earth. Human activities like oil and gas extraction, infrastructure building, and overgrazing cause damage. Other threats include overfishing, dredging, draining, and various forms of water and nutrient pollution. Protecting these areas requires careful assessment of their ecological health to ensure they continue to function for the entire planet.